Thomas reno



UNITED STATES PATENT OFFICE.

THOMAS RENO, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS, OFONE-HALF TO THE DETROIT TOOL COMPANY, OF SAME PLACE.

CLAMP.

SPECIFICATION forming part of Letters Patent No. 266,887, dated October31, 1882,

I Applicationfiled May9,1882. (NomodeL) To all whom it may concern:

Be it known that I, THOMAS RENO, of Detroit, county of Wayne, State ofMichigan, have invented a new and useful Improvement in HandScrew-Clamps; and I declare the following to be a full, clear, and exactdescription of the same, such as will enable others skilled in the artto which it pertains to make and use it, reference being bad ,to theaccompanying IO drawing,which formsapartot'this specification.

My invention consists in the combinations ofdevices and applianceshereinafter specified, and more particularly pointed out in the-claims.

In the drawing the figureis a side elevation 1 of a device embodying myinvention, showing also a part in section.

Heretofore in the manufacture of hand screwclamps they have beenconstructed with a set of wooden screws, whereby thejaws are oper- 2oated.

It is the object of my invention to provide a hand screw-clamp whichshall dispense with the wooden screws, and in which the jaws shall beoperated by means of ratchet-bars having screw-cut tangs and engaginghandles, in connection with a set of suitable spring-pawls.

A and A represent the twojaws.

B and B are the ratchet-bars, on which the ratchets are formed inopposite directions. I)

and b are their screw-cut ends or tangs, b preferably constructed with aright'hand and b with a left-hand screw.

0 and G are the handles. The handle 0 is provided at c with a nutadapted to engage the screw-cut tang of the ratchet-bar. The handle 0 isalso provided with an elongated nut at 0, passing through the jaw A andprovided with the head 0 D and D are spring-pawls, adapted to en- 0 gagewith the ratchet-bars.

d is a link pivoted in the jaw A, and connectingthe two spring-pawls insuch a manner that they may both be operated by one thumb-piece, d.

5 The operation of the device will be readily understood. By disengagingthe spring-pawls from the ratchet-bars the two jaws may be adjusted uponany object, as desired, when, by turningthe handles, each in the samedirection, the jaws may be caused to grip tightly upon the objectbetween them.

By diminishing the size of the orifices required in the jaws, as is doneby my invention, the jaws may be made smaller than when made for woodenscrews, and still have the same strength.

What I claim is- 1. A hand screw-clamp consisting of two jaws united bytwo ratchet-bars having screwcut tangs, and engaging handles, and, inconnection therewith, dogs or pawls upon one of saidjaws, adapted toengage said ratchet-bar's, substantially as described.

2. A hand screw-clamp consisting of two jaws united by two ratchet-barshaving screwout tangs and engaging handles, and, in connectiontherewith. a set of spring dogs or pawls upon one of said jaws, adaptedto engage said ratchet-bars, and a handle and a connectinglink, wherebyboth pawls may be operated simultaneou'sly, substantially as described.

3. The combination, with the jaws, of the two ratchet-bars withscrew-cut tangs and engaging handles,one of said bars provided withpawls or dogs to engage said ratchets, and the ratchets on one barformed in the opposite direction from those of the other bar,substantially as described.

4. The con-ibination, with the jaws, of the two ratchet-bars withscrew-cut tangs and engaging handles, the handle farthest from the freeend ot'the jaws provided with a stationary nut, and, in connectiontherewitb,dogs or pawls upon one of said jaws, adapted to engage saidratchet-bars, substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

THOMAS RENO.

Witnesses:

J. EDWARD WARREN, SAMUEL E. THOMAS.

